
x1,y1,x2,y2=map(float,input().split())
import math
A=math.sqrt((x2-x1)**2+(y2-y1)**2)

B=float('{:.8f}'.format(A))
print(B) x1,y1,x2,y2=map(float,input().split()) x1 map(float,input().split()) map float input().split() ().split () input split y1 x2 y2 import math math A=math.sqrt((x2-x1)**2+(y2-y1)**2) A math.sqrt((x2-x1)**2+(y2-y1)**2) math.sqrt math sqrt (x2-x1)**2+(y2-y1)**2 (x2-x1)**2 x2-x1 x2 x1 2 (y2-y1)**2 y2-y1 y2 y1 2 B=float('{:.8f}'.format(A)) B float('{:.8f}'.format(A)) float '{:.8f}'.format(A) '{:.8f}'.format '{:.8f}' format A print(B) print B x2,y2=map(float,input().split()) map(float,input().split()) x2 x1,y1,x2,y2=map(float,input().split()) map(float,input().split()) x1 A=math.sqrt((x2-x1)**2+(y2-y1)**2) math.sqrt((x2-x1)**2+(y2-y1)**2) A y2=map(float,input().split()) map(float,input().split()) y2 y1,x2,y2=map(float,input().split()) map(float,input().split()) y1 B=float('{:.8f}'.format(A)) float('{:.8f}'.format(A)) B

x1,y1,x2,y2=map(float,input().split())
import math
A=math.sqrt((x2-x1)**2+(y2-y1)**2)

B=float('{:.8f}'.format(A))
print(B)
